you need to have beeten the elite 4 12 times and need to have caught mew that appers randomly in victory road after you have beeten the elite 4 12 times. then you go to seaform islands. after you put the other bolders in the water you will need to surf to the land that's south. and their will be celebi.
get all of your Pokemon to level 100 thn talk to profeser oak and he will say go to the safiry zone amd celibi will be somewhear in the safiry zone!
You can try to Celebi Egg Trick (Google it, you will find details). However, this method could corrupt your data if done improperly, which is very easy to do...
without gameshark or action replay, NO
Celebi cannot be obtained in Pokemon FireRed or LeafGreen legitimately without trading. There are no events for Celebi currently and an GameShark may be required.
There is no Celebi Island...
you cannot catch celebi in Pokemon leafgreen. you can only get it through cheat codes or trading.
To get all Pokemon you have to trade with other gamepacks. Leafgreen, Firered, Emerald and Sapphire. I managed to do it, because one of my friends had cheated celebi and jirachi.
cheat.
You can get it by using action replay or gameshark
Nintendo events
not possible
you can trade it
you can use gameshark code
besides gameshark? you cant.